Relative fat distribution in relation to menarcheal status among Bengalee Hindu girls of West Bengal, India

Background: Menarche seems be related to the relative distribution rather than the total amount of body fat. Previous studies showed that the ratio between lower-body vs. upper-body fat was associated with the timing of menarche. Aim: To compare the relative distribution of subcutaneous fat among Bengali Hindu pre- and post-menarcheal girls. Materials and Methods: The participants were 234 Bengali Hindu girls aged 11-14 years: 111 pre-menarcheal and 123 post-menarcheal girls, randomly selected from a secondary school from a suburb of Kolkata, West Bengal, India. Triceps, abdominal, sub-scapular, and calf skinfolds were measured. For each skinfold site, ratio was calculated as follows: Log (one skinfold/sum of skinfolds). Principal components (PC) analysis was performed to derive components which express the maximum contrast among the log of ratios. T -test was employed to assess differences between individual scores of components between pre- and post-menarcheal girls. Results: The three identified PC suggested extremities-trunk, lower trunk-upper trunk, and an upper extremity-lower extremity contrasts, respectively. Scores for second and third components showed significant differences between pre- and post-menarcheal groups of girls. Conclusion: The attainment of menarche by Bengali girls aged 11-14 years was associated with characteristically more relative subcutaneous fat distribution in the upper trunk and in the lower limbs, in contrast to lower trunk and upper limbs, respectively.